首页 | 本学科首页   官方微博 | 高级检索  
     

Comparison of CO2 Effluxes and Their Driving Factors Between Two Temperate Steppes in Inner Mongolia, China
引用本文:齐玉春,董云社,耿元波,刘立新. Comparison of CO2 Effluxes and Their Driving Factors Between Two Temperate Steppes in Inner Mongolia, China[J]. 大气科学进展, 2006, 23(5): 726-736. DOI: 10.1007/s00376-006-0726-6
作者姓名:齐玉春  董云社  耿元波  刘立新
作者单位:[1]Institute of Geographical Sciences and Natural Resources Research, CAS, Beijing 100101 [2]Department of Geography, Mainz University, Mainz 55099, Germany [3]Graduate University of the Chinese Academy of Sciences, Beijing 100039
基金项目:中国科学院"百人计划",国家自然科学基金,the project on the Carbon Cycle and Driving Mecha
摘    要:Soil respiration is a key component of the global terrestrial ecosystem carbon cycle. The static opaque chamber method was used to measure the CO2 effluxes from soil of a semiarid Aneurolepidium chinense steppe and a Stipa krylovii steppe in the Xilin River Basin of Inner Mongolia, China from March 2002 to December 2004. The results indicated that the soil respiration rates of the semiarid Aneurolepidium chinense steppe and the Stipa krylovii steppe were both relatively high from mid-May to mid-September of each year and remained low during the rest of the year. The minimum value of soil respiration occurred in December or January and negative effluxes of CO2 appeared for several days during the non-growing season of individual years at the two sampling sites. A high annual variation was found in the two steppes with the coefficients of variance (CV) being over 94%, even high to 131%. The annual sums of soil CO2 efflux of the Aneurolepidium chinense steppe varied between 356.4 gC m?2 yr?1 and 408.8 gC m?2 yr?1, while those of the Stipa krylovii steppe in the three years were in the range of 110.6 gC m?2 yr?1 to 148.6 gC m?2 yr?1. The mean respiration rates of the Aneurolepidium chinense steppe were significantly higher than those of the Stipa krylovii steppe in different statistical periods with the exception of the non-growing season. About 59.9% and 80.6% of the soil respiration variations in both steppes for the whole sampling period were caused by the changes of temperature and soil water content. In the Aneurolepidium chinense steppe, the soil respiration rate has significant or extremely significant positive correlation (r = 0.58 ? 0.85, p < 0.05 or p < 0.01) with air temperature and ground temperature of the topsoil except in 2002; the unique contributions of temperature change to the soil respiration variation of the three years were 53.3%, 81.0% and 58.6%, respectively. But, for the Stipa krylovii steppe in the same time interval, the soil water content (especially that of the 10–20 cm layer) has a greater effect on the change of soil respiration, and the unique contributions of the change of the 10–20 cm soil water content to the variations of soil respiration in 2002 and 2003 were 60.0% and 54.3%, respectively. In 2004, in spite of the higher contribution of temperature than soil water content, the contribution of ground temperature at a depth of 10 cm was only 46.2%, much weaker than that of any single year in the Aneurolepidium chinense steppe.

关 键 词:草原 内蒙古 土壤 呼吸作用 半干旱地区 二氧化碳
收稿时间:2005-10-13
修稿时间:2006-02-13

Comparison of CO2 effluxes and their driving factors between two temperate steppes in Inner Mongolia, China
Yuchun Qi,Yunshe Dong,Manfred Domroes,Yuanbo Geng,Lixin Liu,Xingren Liu. Comparison of CO2 effluxes and their driving factors between two temperate steppes in Inner Mongolia, China[J]. Advances in Atmospheric Sciences, 2006, 23(5): 726-736. DOI: 10.1007/s00376-006-0726-6
Authors:Yuchun Qi  Yunshe Dong  Manfred Domroes  Yuanbo Geng  Lixin Liu  Xingren Liu
Affiliation:Institute of Geographical Sciences and Natural Resources Research, CAS, Beijing 100101,Institute of Geographical Sciences and Natural Resources Research, CAS, Beijing 100101, Department of Geography, Mainz University, Mainz 55099, Germany,Department of Geography, Mainz University, Mainz 55099, Germany,Institute of Geographical Sciences and Natural Resources Research, CAS, Beijing 100101,Institute of Geographical Sciences and Natural Resources Research, CAS, Beijing 100101, Graduate University of the Chinese Academy of Sciences, Beijing 100039,Institute of Geographical Sciences and Natural Resources Research, CAS, Beijing 100101, Graduate University of the Chinese Academy of Sciences, Beijing 100039
Abstract:Soil respiration is a key component of the global terrestrial ecosystem carbon cycle. The static opaque chamber method was used to measure the CO2 effluxes from soil of a semiarid Aneurolepidium chinense steppe and a Stipa krylovii steppe in the Xilin River Basin of Inner Mongolia, China from March 2002 to December 2004. The results indicated that the soil respiration rates of the semiarid Aneurolepidium chinense steppe and the Stipa krylovii steppe were both relatively high from mid-May to mid-September of each year and remained low during the rest of the year. The minimum value of soil respiration occurred in December or January and negative effluxes of CO2 appeared for several days during the non-growing season of individual years at the two sampling sites. A high annual variation was found in the two steppes with the coefficients of variance (CV) being over 94%, even high to 131%. The annual sums of soil CO2 efflux of the Aneurolepidium chinense steppe varied between 356.4 gC m-2 yr-1 and 408.8 gC m-2 yr-1, while those of the Stipa krylovii steppe in the three years were in the range of 110.6 gC m-2 yr-1 to 148.6 gC m-2 yr-1.The mean respiration rates of the Aneurolepidium chinense steppe were significantly higher than those of the Stipa krylovii steppe in different statistical periods with the exception of the non-growing season.About 59.9% and 80.6% of the soil respiration variations in both steppes for the whole sampling period were caused by the changes of temperature and soil water content. In the Aneurolepidium chinense steppe, the soil respiration rate has significant or extremely significant positive correlation (r=0.58-0.85, p<0.05 or p<0.01) with air temperature and ground temperature of the topsoil except in 2002; the unique contributions of temperature change to the soil respiration variation of the three years were 53.3%, 81.0% and 58.6%, respectively. But, for the Stipa krylovii steppe in the same time interval, the soil water content (especially that of the 10-20 cm layer) has a greater effect on the change of soil respiration, and the unique contributions of the change of the 10-20 cm soil water content to the variations of soil respiration in 2002 and 2003 were 60.0% and 54.3%, respectively. In 2004, in spite of the higher contribution of temperature than soil water content, the contribution of ground temperature at a depth of 10 cm was only 46.2%, much weaker than that of any single year in the Aneurolepidium chinense steppe.
Keywords:semiarid  Aneurolepidium chinense steppe  Stipa krylovii steppe  soil respiration  driving factors  comparison
本文献已被 CNKI 维普 万方数据 SpringerLink 等数据库收录!
点击此处可从《大气科学进展》浏览原始摘要信息
点击此处可从《大气科学进展》下载全文
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号